Prehysterical In this Pip Worlds sourcebook, you’ll find the rules you need to play as cave people during the time of the thunder lizards. And, because it’s way cooler to imagine all the different dinosaurs living together at the same time, we’re going to all politely ignore historical facts and use hysterical facts instead. Don’t let your inner paleontologist shush you. It doesn’t matter if one dinosaur was from the Jurassic period and another from the Triasic period. If they’re both dinosaurs, they’re welcome here. In fact, we’ll allow anything from the Cambrian Explosion through the last Ice Age. How’s that for generosity?